Haid trained both as a dancer and singer and became the epitome of the Süßes Wiener Mädel ("Sweet Viennese Girl") and a popular pin-up throughout the 1920s and 1930s.

Her first motion picture was a propaganda film made during the First World War, Mit Herz und Hand fürs Vaterland (1916).

She worked for UFA and, as a trained singer, easily made the transition to the sound era, appearing in comedy films alongside Austrian and German stars such as Willi Forst, Bruno Kastner, Georg Alexander, Theo Lingen, and Heinz Rühmann.

Spycher adopted Liane's son, Pierre (born 1940), who was the result of her second marriage to Hans Somborn.

Her notable films include Lady Hamilton (1921; her breakthrough role); Lucrezia Borgia (1922); The Csardas Princess (1927, based on the operetta by Emmerich Kálmán); and the talkies The Song Is Ended (1930) and Ungeküsst soll man nicht schlafen gehn (1936).